function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 1],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Chen, Feng & He, Hai', 1],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 9],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 1],
    ['Gao, Lian-Ming & Tan, Shao-Lin & Zhang, Gui-Liang', 1],
    ['Gao, Lian-Ming & Zhang, Gui-Liang & Mo, Zhi-Qiong', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Kvaček, Zlatko & Teodoridis, Vasilis & Radoň, Miroslav', 1],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Lu, Yi-Fei & Chen, Zi-Lin & He, An-Guo & Liu, Ju-Lian', 1],
    ['Suh, Soo-Jung', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=27)',
    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);