function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 4],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Chen, Xin & Ma, JianHui & Geng, LiYang', 2],
    ['Denk, Thomas & Sami, Marco & Teodoridis, Vasilis', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 7],
    ['Info Flora', 12],
    ['Jarvis, Charlie', 7],
    ['Kainulainen, Kent & Sjöman, Henrik & Aldén, Björn', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 7],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Li, Meng & Gao, Xin-Fen & Tian, Jing & Ju, Wen-Bin', 1],
    ['Li, Meng & Sylvester, Steven P. & Wang, Zhang-Pei & Pei, Yi-Da', 2],
    ['Linnaeus, Carolus', 2],
    ['Qiu, Jing & Zhao, Yang & Qi, Qi & Chen, Xin', 1],
    ['Tang, Chen-Qian & Zhang, Xiao-Chen & Chen, Xin', 1],
    ['Other (1)', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=52)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);