function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 1],
    ['Fan, Xue-Ping & Lu, Ngan Thi & Zhang, Liang & Zhang, Li-Bing', 2],
    ['Fan, Xue-Ping & Zhang, Liang & Knapp, Ralf & He, Hai', 1],
    ['Li, Xiaojuan & Li, Jianxiu & Meng, Fanyun', 1],
    ['Rakotondrainibe, France & Duhem, Bernard & Reeb, Catherine', 1],
    ['Wang, Renxiang & Shao, Wen & Liu, Ling', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=7)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);