function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['A. Darshan & N. Anganthoibi & W. Vishwanath', 1],
    ['Anuradha, S.', 1],
    ['Aqmal-Naser, Mohamad & Ali, Norsyafira Anis', 2],
    ['Baycelebi, Esra', 1],
    ['Eagderi, Soheil & Mouludi-Saleh, Atta & Esmaeili, Hamid Reza', 2],
    ['Hamilton, F. Buchanan', 2],
    ['Hui, Tan Heok & Peng, Kelvin Lim Kok & Huan, Liew Jia', 2],
    ['Ng, Casey Keat Chuan & Lim, Teow Yeong & Ahmad, Amirrudin', 4],
    ['Ng, H. H. Tan H. H.', 5],
    ['Ng, Heok Hee', 3],
    ['Plamoottil, Mathews & Abraham, Nelson P.', 2],
    ['Prosanta Chakrabarty & Heok Hee Ng', 5],
    ['Roberts, Tyson R.', 3],
    ['Saad, Adib & Çiçek, Erdoğan & Esmaeili, Hamid Reza', 2],
    ['Sayyadzadeh, Golnaz & Esmaeili, Hamid Reza', 2],
    ['Other (16)', 16]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    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);