function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Habib, Kamran & Zulfiqar, Rizwana & Khalid, Abdul Nasir', 1],
    ['Kalb, Klaus & Buaruang, Kawinnat & Mongkolsuk, Pachara', 1],
    ['Khan, Memoona & Khalid, Abdul Nasir & Lumbsch, H. Thorsten', 1],
    ['Shɨshkin-Skarð, Yegor', 1],
    ['Wijayawardene, Nalin N. & Dai, Dong-Qin & Premarathne, Bhagya M.', 2],
    ['Xie, Cong-Miao & Wang, Li-Song & Zhao, Zun-Tian & Zhang, Yan-Yun', 17],
    ['van den Boom, Pieter P. G. & Clerc, Philippe & Ertz, Damien', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=24)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);