function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 2],
    ['Berek-Nagy, Peter Janos & Gergo Toth & Szilvia Bosze', 2],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 5],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 6],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 8],
    ['Info Flora', 8],
    ['Jarvis, Charlie', 18],
    ['Kilian, Norbert & Djavadi, Seyyedeh Bahereh & Eskandari, Majid', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 6],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 4],
    ['Melzer, H. & Barta, Th.', 1],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 3],
    ['Volynkin, Anton V. & Saldaitis, Aidas & Višinskas, Vytautas', 1],
    ['Zhang, Jian-Wen & Kilian, Norbert & Huang, Jiang-Hua & Sun, Hang', 1],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=69)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);